| 摘要 |
PROBLEM TO BE SOLVED: To constitute an electromagnetic drive motor adaptable to a small space by arranging first and second coils collectively in one direction on the outside of the outer circumferential part of a rotor while superposing a first stator yoke on a second stator yoke in the direction of the rotational axis of the rotor. SOLUTION: Hole part 2a of a second rotor 2 is applied over the shaft 1d of a first rotor 1, a gear 1c is provided in the center of thrust in the direction of the rotational axis and columnar parts having a magnetized part on the outer circumferential surface are provided above and below the thrust part of the gear 1c thus constituting a rotorα. First stator yokes 3, 4 are superposed on second stator yokes 5, 6 in the direction of the rotational axis of the rotorα. First and second coils 7, 8 are arranged collectively in one direction on the outside of the outer circumferential part of the rotor (a). First and second motor cases 9, 10 are then engaged to obtain a unitized stepping motor.
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